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    <title>SNAP Data Processors - C2RCC MERIS-4 Processing Parameters</title>
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        <td class="header">C2RCC MERIS-4 Processing Parameters</td>
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<h3>MERIS (4th-reprocessing) Processing Parameters</h3>

<img src="images/proc_params/c2rcc_meris4_proc_params.png" align="right"/>

<ul>
    <li><b>Valid-pixel expression</b><br>
        The arithmetic expression defines the pixels which are valid for processing. Pixels which are not valid will be marked as no-data in the
        target product.
    </li>
    <li><b>Salinity</b><br>
        The value used as water salinity for the scene.
    </li>
    <li><b>Temperature</b><br>
        The value used as water temperature for the scene.
    </li>
    <li><b>Ozone</b><br>
        The value used as ozone if not provided by auxiliary data
    </li>
    <li><b>Air Pressure</b><br>
        The surface air pressure at sea level if not provided by auxiliary data
    </li>
    <li><b>TSM factor bpart</b><br>
        Conversion factor bpart. (TSM = bpart * <b>TSMfakBpart</b> + bwit * TSMfakBwit)
    </li>
    <li><b>TSM factor bwit</b><br>
        Conversion factor bwit. (TSM = bpart * TSMfakBpart + bwit * <b>TSMfakBwit</b>)
    </li>
    <li><b>CHL exponent</b><br>
        Chlorophyll exponent (CHL = iop-apig^<b>CHLexp</b> * CHLfak)
    </li>
    <li><b>CHL factor</b><br>
        Chlorophyll factor (CHL = iop-apig^CHLexp * <b>CHLfak</b>)
    </li>
    <li><b>Threshold rtosa OOS</b><br>
        Threshold for out of scope of nn training dataset flag for gas corrected top-of-atmosphere reflectances
    </li>
    <li><b>Threshold AC reflectances OOS</b><br>
        Threshold for out of scope of nn training dataset flag for atmospherically corrected reflectances
    </li>
    <li><b>Threshold for cloud flag on down transmittance @865</b><br>
        Threshold for cloud test based on downwelling transmittance @865.
    </li>
    <li><b>Atmospheric aux data path</b><br>
        Path to the atmospheric auxiliary data directory. Use either this or the specified products on the I/O Parameters (ozone, air pressure) tab. If the auxiliary data is
        not available at this path, the data will automatically be downloaded.
    </li>
    <li><b>Alternative NN Path</b><br>
        Path to an alternative set of neuronal nets. Use this to replace the standard set of neuronal nets.
        For MERIS there exits a neural net where ranges of parameters was extended to moderate-to-extreme cases (C2X-Nets).
        However, this is a parameter which should only used during the development of new neural nets.
    </li>
    <li><b>Output AC reflectances as rrs instead of rhow</b><br>
        Write remote sensing reflectances instead of water leaving reflectances.
    </li>
    <li><b>Derive water reflectance from path radiance and transmittance</b><br>
        Alternative way of calculating water reflectance. <span style="background-color:yellow">Still experimental.</span>
    </li>
    <li><b>Output gas corrected TOSA reflectances</b><br>
        Can be enabled to include the TOSA reflectances in the target product.
    </li>
    <li><b>Output TOA reflectances</b><br>
        Add TOA reflectances to the target product.
    </li>
    <li><b>Output gas corrected TOSA reflectances</b><br>
        Add TOSA reflectances to the target product.
    </li>
    <li><b>Output gas corrected TOSA reflectances of auto nn</b><br>
        Add TOSA reflectances of the autoassociative neural net to the target product.
    </li>
    <li><b>Output path radiance reflectances</b><br>
        Add path radiance reflectances to the target product
    </li>
    <li><b>Output downward transmittance</b><br>
        Add downward transmittance to the target product
    </li>
    <li><b>Output upward transmittance</b><br>
        Add upward transmittance to the target product
    </li>
    <li><b>Output atmospherically corrected angular dependent reflectances</b><br>
        Add atmospherically corrected angular dependent reflectances to the target product
    </li>
    <li><b>Output normalized water leaving reflectances</b><br>
        Add normalized water leaving reflectances to the target product
    </li>
    <li><b>Output of out of scope values</b><br>
        Add out of scope to the target product
    </li>
    <li><b>Output of irradiance attenuation coefficients</b><br>
        Add irradiance attenuation coefficients to the target product
    </li>
    <li><b>Output uncertainties</b><br>
        Add uncertainties to the target product
    </li>
</ul>
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